| Ad Malerarbeid AS | Construction | 2009 |
| Advania Focus AS | Information & communication | 1998 |
| Akershus Maskin Og Hengerutleie AS | Administrative & support | 2025 |
| Alea Eiendom AS | Real estate | 2025 |
| Algebra Investments AS | Health & social care | 2019 |
| Aliment AS | Wholesale & retail | 2016 |
| Anders Færgestad AS | Real estate | 2014 |
| Animis AS | | 2020 |
| Ar Renhold AS | Administrative & support | 2020 |
| Arctic Vans AS | Transport & logistics | 2025 |
| AS Deka | Manufacturing | 1987 |
| Assemble Monter AS | Professional & scientific | 2019 |
| Assembletile AS | | 2013 |
| Astro Ipr AS | Administrative & support | 2024 |
| Astro Security AS | Manufacturing | 2015 |
| Atecco AS | Construction | 2020 |
| Atl Invest AS | Real estate | 2015 |
| Atom Holding AS | Real estate | 2014 |
| Aune Og Hovland AS | Construction | 1999 |
| Aune Og Hovland Eiendom AS | Real estate | 2003 |
| Aur Eiendom AS | Real estate | 2000 |
| Aur Energi AS | Wholesale & retail | 2019 |
| Aur Invest AS | Wholesale & retail | 2015 |
| Aur Sjokolade AS | Administrative & support | 2009 |
| Aur Vakta AS | Administrative & support | 2025 |
| Aura Trening Og Helse AS | Arts & recreation | 2017 |
| Aurskog Apotek AS | Wholesale & retail | 2002 |
| Aurskog Bygg & Renhold AS | Administrative & support | 2016 |
| Aurskog Bygg & Vedlikehold AS | Real estate | 2012 |
| Aurskog Bygg AS | Construction | 2009 |
| Aurskog Eiendom AS | Real estate | 1988 |
| Aurskog Eiendomsinvest AS | Real estate | 2009 |
| Aurskog Eiendomsselskap AS | Manufacturing | 2016 |
| Aurskog El-Forretning AS | Wholesale & retail | 2018 |
| Aurskog Elektriske Eiendom AS | Real estate | 2020 |
| Aurskog Elektriske Holding AS | Construction | 2016 |
| Aurskog Elektriske Installasjon AS | Construction | 2017 |
| Aurskog Farge Og Interiør AS | Wholesale & retail | 2010 |
| Aurskog Fysikalske Institutt Da | Health & social care | 2015 |
| Aurskog Golfpark Drift AS | Arts & recreation | 2018 |
| Aurskog Graveservice AS | Construction | 1980 |
| Aurskog Holding AS | Real estate | 2019 |
| Aurskog Legekontor Da | Health & social care | 2004 |
| Aurskog Plate Og Blikkenslagerverksted Ans | Construction | 1993 |
| Aurskog Power AS | Construction | 2004 |
| Aurskog Restaurantdrift AS | Hospitality | 2026 |
| Aurskog Sparebank | Financial services | 1846 |
| Aurskog Tannlegesenter AS | Health & social care | 1987 |
| Aurskog Utvikling AS | Real estate | 2019 |
| Aurskog Ventilasjon Og Blikkenslagerverksted AS | Construction | 1984 |
| Aurskog Vertshus Ans | Hospitality | 1993 |
| Aurskog-Høland Utbyggingsselskap AS | Real estate | 1986 |
| B E Torp AS | Construction | 2021 |
| B.O.F Maskin AS | Construction | 2022 |
| Bakke AS | Construction | 2013 |
| Bakke Bolig Aurskog AS | Real estate | 2008 |
| Bakke Bolig Jessheim AS | Real estate | 2016 |
| Bakke Fam Holding AS | | 2025 |
| Bakke Leiligheter AS | Real estate | 2010 |
| Bakke Prosjekt AS | Real estate | 2005 |
| Bakkegruppen AS | Professional & scientific | 2012 |
| Bakkegruppen Eiendom AS | Real estate | 2022 |
| Bakkegruppen Holding AS | Real estate | 2019 |
| Banana Airlines AS | Information & communication | 2025 |
| Bankenes Boligmegler AS | Real estate | 1999 |
| Bannsverk Holding AS | Administrative & support | 2023 |
| Baseit Holding AS | | 2022 |
| Bedre Skoler AS | Education | 2017 |
| Bemag B Og M Halla | Wholesale & retail | 1986 |
| Berge Bygdeservice AS | Construction | 2022 |
| Berger Gruppen AS | | 2021 |
| Berger Hage Holding AS | Real estate | 2017 |
| Bergerteigen Skog Ans | Agriculture & fishing | 1986 |
| Bevan Holding AS | | 2026 |
| BG Utleie AS | Administrative & support | 2003 |
| Bgai AS | | 2025 |
| Bilimport TM AS | Wholesale & retail | 2023 |
| Black & Grey Consulting AS | Professional & scientific | 2026 |
| Blakerveien 1144-1148 AS | Real estate | 2026 |
| Blekkhuset Lierfoss AS | Real estate | 2009 |
| Blesjå Eiendom AS | Real estate | 2021 |
| BMT Energi AS | Wholesale & retail | 2025 |
| BN Eiendom AS | Real estate | 1999 |
| Bogstad Bilservice AS | Other services | 2007 |
| Boldbooks AS | Professional & scientific | 2016 |
| Brendhagen Holding AS | | 2026 |
| Brubak Holding AS | | 2023 |
| Bråtejordet Utvikling AS | Real estate | 2020 |
| Brødrene Melby Transport AS | Transport & logistics | 1982 |
| Btbjørk Konsept AS | | 2025 |
| Byggimpuls AS | Construction | 2005 |
| Byggup AS | Wholesale & retail | 2011 |
| C-Lys Holding AS | Wholesale & retail | 2015 |
| Cavok AS | | 2022 |
| Christer Sveistrup Holding AS | | 2020 |
| Chtl Gruppen AS | | 2022 |
| Cicada Music Ans | Wholesale & retail | 1988 |
| Cordis International AS | Information & communication | 2021 |
| CTS Eiendom AS | Real estate | 2025 |
| Dammerud AS | Wholesale & retail | 2022 |